CVD modifications of porous Vycor silica for gas separation and sensor applications

The work reviews approaches for the CVD-modification of Vycor silica tubes beyond the widely exposed method of plain asymmetric pore blocking. Both cu rrently pursued routes as well as potential future approaches are described . The presentation covers the asymmetric narrowing of pores, the uniform bu t limited -in-degree deposition, the formation of double pore networks and the template approach. Modifications aim at the generation of membranes app ropriate for gas and/or vapor separation or sensor applications.